Affiliation: | 1. Division of Nanomaterials Science, EcoTopia Science Institute, Nagoya University, Furo‐cho, Chikusa‐ku, Nagoya 464‐8603 (Japan), Fax: (+81)?52‐789‐2121;2. Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita‐ku, Sapporo 060‐8628 (Japan) |